Concrete and block quantities
Calculators and guides for working out how much concrete or block to buy.
Guides and calculators
Concrete Slab Calculator: Cubic Yards and Bags
Enter your slab's length, width and thickness to get cubic yards and the number of 80, 60 and 40 lb bags, with the formula and a worked example.
Concrete and block quantitiesHow to Calculate Cubic Yards of Concrete
The formula for cubic yards of concrete, a shortcut for slabs, how to handle round and triangular shapes, and worked examples you can check.
Concrete and block quantitiesHow Many Bags of Concrete Do You Need?
How many 80, 60 and 40 lb bags make a cubic yard, with a chart for common 4-inch slabs and the published yields behind the numbers.
Concrete and block quantitiesHow Thick Should a Concrete Slab Be?
What the International Residential Code says about slab-on-ground floors, why your project may need more, and how thickness changes the concrete you buy.
Concrete and block quantitiesConcrete Block Calculator: Blocks and Mortar
Enter your wall's length and height to estimate standard concrete blocks, courses and mortar, using a published rule of thumb of 1.125 blocks per square foot.
Concrete and block quantitiesConcrete Footing Calculator
Enter your footing's total length, width and thickness to get cubic yards and bags of concrete, with the formula and a worked example.
Concrete and block quantitiesConcrete Steps Calculator: Yards and Bags
Work out how much concrete solid steps need, with an optional top landing, in cubic yards and bags, plus the code's step figures and what to check first.
Concrete and block quantitiesRebar Calculator: Bars, Stock Lengths and Weight
A shopping count of rebar for a slab grid: bars, total feet, stock lengths and weight. It doesn't tell you what size or spacing your slab needs.
Concrete and block quantitiesSonotube Concrete Calculator for Round Columns
Work out how much concrete a Sonotube or other round form takes, by diameter, height and number of columns, with a per-foot chart and bag counts.
Concrete and block quantitiesFence Post Concrete Calculator
Work out how many bags of concrete your fence posts need from the hole size, post size and number of posts, with QUIKRETE's post-setting guidance.
Concrete and block quantitiesConcrete Weight Calculator
Estimate how much a concrete slab weighs, using about 140 lb per cubic foot, or 3,780 lb per cubic yard. Includes a chart and the formula.
Concrete and block quantitiesHow Much Water Per Bag of Concrete? Mixing and Curing
How much water to add to 40, 60 and 80 lb bags of concrete mix, how to mix by hand, and how long QUIKRETE says to keep curing.